含钛高炉渣黏度和熔化性能  

Viscosity and melting property of titanium-containing slag

作　　者：邱国兴 缪德军 蔡明冲 李小明[1] 战东平 柳勇发 QIU Guo-xing;MIAO De-jun;CAI Ming-chong;LI Xiao-ming;ZHAN Dong-ping;LIU Yong-fa(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,Shaanxi,China;School of Metallurgy,Northeastern University,Shenyang 110189,Liaoning,China;Laiwu Ironmaking Plant,Shandong Iron and Steel Co.,Ltd.,Ji'nan 271104,Shandong,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]东北大学冶金学院,辽宁沈阳110189 [3]山东钢铁股份有限公司莱芜分公司炼铁厂,山东济南271104

出　　处：《钢铁》2022年第11期42-52,共11页Iron and Steel

基　　金：陕西省自然科学基金青年基金资助项目(2021JQ-502);河北省自然科学基金资助项目(E2021417001)。

摘　　要：基于混料试验中单纯形质心法建立了CaO-SiO_(2)-Al_(2)O_(3)-MgO-2%TiO_(2)渣黏度和熔化性能预测模型,利用预测模型、FactSage和X射线衍射(XRD)研究了不同w(Al_(2)O_(3))含钛炉渣的冶金性能,并探讨了高Al_(2)O_(3)炉渣中w(MgO)/w(Al_(2)O_(3))对黏度和熔化性能的影响。结果表明,炉渣黏度和熔化性能预测模型具有较高的精度,误差分别小于5%和2%。随着Al_(2)O_(3)质量分数由10%增加至18%,黏度(η)、熔化性温度(t_(M))和液相线温度(t_(L))均升高;低熔点相黄长石(Melilite)开始析出温度和析出量逐渐增大,高熔点相钙钛矿(CaTiO_(3))和低熔点相硅灰石(CaSiO_(3))开始析出温度先增大后减小,还析出了少量高熔点相尖晶石。当Al_(2)O_(3)质量分数小于15%、温度为1450~1525℃时,炉渣黏度均小于0.55 Pa·s,且温度为1500℃时黏度为0.32~0.39 Pa·s,t_(M)和t_(L)分别为1370℃和1330℃;Al_(2)O_(3)质量分数为15%~18%,炉渣析出的高熔点相CaTiO_(3)和尖晶石较多,黏度对温度较为敏感,1525℃时黏度为0.3 Pa·s左右,1450℃时黏度增加至0.8 Pa·s。随着w(MgO)/w(Al_(2)O_(3))由0.24增加至0.72,炉渣黏度降低,t_(M)和t_(L)增大;Melilite开始析出温度约为1425℃,CaTiO_(3)开始析出温度由1310℃大幅增加至1394℃,CaSiO_(3)析出量降低,尖晶石析出量明显增加。此外,不同w(Al_(2)O_(3))和w(MgO)/w(Al_(2)O_(3))炉渣基础相均为Melilite,其开始析出温度高于CaTiO_(3);w(Al_(2)O_(3))对t_(M)和Melilite开始析出温度影响显著,w(MgO)/w(Al_(2)O_(3))对t_(L)和CaTiO_(3)开始析出温度影响显著。当碱度为1.21时,高Al_(2)O_(3)炉渣适宜w(MgO)/w(Al_(2)O_(3))为0.48~0.60,t_(M)和t_(L)分别为1400℃和1340℃左右,炉渣流动性和稳定性较好。Based on the simplex centroid method in the mixing test,prediction models for the viscosity and melting property of CaO-SiO_(2)-Al_(2)O_(3)-MgO-2%TiO_(2)slags were established.The metallurgical properties of different Al_(2)O_(3)titanium-containing slags were studied by using the prediction models,FactSage and XRD.The influence of w(MgO)/w(Al_(2)O_(3))on viscosity and melting property of high Al_(2)O_(3)slag was also discussed.The results show that prediction models of slag viscosity and melting property has high accuracy,with errors less than 5%and 2%,respectively.With the increase of w(Al_(2)O_(3))from 10%to 18%,viscosity(η),melting temperature(t_(M))and liquidus temperature(t_(L))all increased.Both the precipitation temperature and precipitation amount of the low melting point Melilite phase increased.The precipitation temperature of the high melting point perovskite phase CaTiO_(3)and low melting point CaSiO_(3)phase increased first and then decreased.A small amount of high melting point Spinel phase was precipitated.When w(Al_(2)O_(3))was less than 15%,the slag viscosity was below 0.55 Pa·s at 1450-1525℃,and 0.32-0.39 Pa·s at 1500℃,t_(M)and t_(L)were lower than 1370℃and 1330℃,respectively;w(Al_(2)O_(3))was 15%-18%,the high melting point phase CaTiO_(3)and spinel were more precipitated from slags.The viscosity was more sensitive to temperature,the viscosity was about 0.3 Pa·s at 1525℃,and increased to 0.8 Pa·s at 1450℃.When w(MgO)/w(Al_(2)O_(3))increased from 0.24 to 0.72,viscosity decreased,and t_(M)and t_(L)increased.The precipitation temperature of Melilite was about 1425℃,and the precipitation temperature of CaTiO_(3)increased from 1310℃to 1394℃.The precipitation amount of CaSiO_(3)decreased,and the precipitation amount of spinel increased significantly.In addition,the slags base phase of different w(Al_(2)O_(3))and w(MgO)/w(Al_(2)O_(3))are Melilite,and their precipitation temperature is higher than CaTiO_(3).Al_(2)O_(3)has a significant effect on the precipitation temperature and t

关 键 词：含钛渣 混料试验 黏度 熔化性能 w(MgO)/w(Al2O3) 相组成 

分 类 号：TF534[冶金工程—钢铁冶金]